Many drinks contain more sugar than full-fat fizzy pop which are infamous for its effect on teeth

The smoothie packaging also claims it contains a full portion of fruit, no sweeteners — and no added sugar.

It is easy to see how parents can make the wrong choices for their kids’ teeth.

Last year the Government proposed a sugar tax on soft drinks, to take effect in 2018. But this will not cover pure fruit juices or smoothies.

Dr Nigel Carter, of the Oral Health Foundation, said: “There is a lack of awareness in being able to recognise when there are hidden sugars in drinks often marketed as “healthy”, especially smoothies and fruit juices.”

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We also discovered that a 180ml carton of Innocent Just For Kids Pineapple, Apple and Carrot Smoothie contains more than four and a half teaspoons of sugar (18g) — very nearly the maxi­mum recommended daily amount for four to six-year-olds.